KR101606325B1 - Flexible Forming Apparatus using a local bending effect - Google Patents

Abstract

The present invention relates to a flexible forming apparatus using a local bending effect, and to ″the flexible forming apparatus using the local bending effect″ which includes a plurality of forming punches across a board plank to be formed; and improves forming ability by causing the local bending effect by arranging the forming punch in order for a center axis of each forming punch at one of an upper side and a lower side across the board plank to be located among the center axis of each forming punch on the other of the upper side and the lower side. According to the present invention, a number of forming punches are arranged up and down. Each forming punch includes a punch head, a hollow type outer member having an internal screw thread, and an internal member having an external screw thread. One of the external member and the internal member is connected to the punch head, and the other is connected to a rotational axis. Each forming punch includes more than one punch control motor capable of providing torque by being interlocked to each rotational axis. The forming punches are arranged in a plurality of rows and in a plurality of columns up and down. Because a center axis of the forming punch on one of the upper side and the lower side of the forming punches is located among a center axis of an adjacent forming punch on the other side opposite to the center axis of the forming punch on one side in correspondence to the same, local bending occurs during forming; thereby improving a forming ability.

Description

[0001] The present invention relates to a flexible forming device using a local bending effect,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable forming apparatus using a local bending effect and includes a plurality of forming punches arranged vertically with a plate to be formed therebetween, Quot; a variable shaping apparatus using a local bending effect "for improving the formability by arranging the shaping punches so as to be positioned between the central axes of the adjacent forming punches facing each other .

Generally, in order to form a plate material such as a thick plate or a thin plate into a desired shape, molds 101 and 103 matching the target shape are disposed on the upper and lower sides as shown in Fig. 1, and the plate material 105 is pressed therebetween. The conventional sheet metal forming method using a metal mold is a method widely adopted for mass production of small or medium-sized products in a manner suitable for mass production of a single product. However, in the case of forming a large number of large plate materials such as a ship or an aircraft, the mold and the forming press also need to be enlarged to increase the cost. However, the number of molding is not so large and the waste is large. There are a lot of problems, so the method of using the mold is difficult to use.

As a method for forming such a large plate material, there has been proposed a plate material forming apparatus in which a plurality of forming punches, in which electric motors or step motors are connected to each other, are vertically disposed, as described in US Pat. No. 4,212,188.

As shown in Fig. 2, each of the forming punches is configured such that one rod 111 having a thread is moved up and down by a motor 112, and a ball- And the plate material is molded.

However, such a sheet material forming apparatus requires a motor 112 to be provided on a rod 111 of each of the forming punches in a one-to-one manner, so that the structure is very complicated, and the load that a forming punch having one rod 111 can support is not large The load is easily buckled and the thickness of the applicable plate is limited.

In order to solve such a problem, Korean Patent Registration No. 10-1034592 proposed by the present applicant with the proposed technique, entitled " Plate material forming apparatus including a plurality of forming punches and method of forming a plate material using the same, "

As shown in FIG. 3, the patented technology is a die-less sheet material forming apparatus suitable for forming a small-sized sheet material of various sizes, and it is possible to form sheet materials of various sizes and thicknesses by increasing load bearing capacity, The present invention provides a plate material forming apparatus capable of controlling a plurality of forming punches, and a plate material forming method using such a device. In the plate material forming apparatus in which a plurality of forming punches are arranged vertically, each of the forming punches 201 has a punch head, One of the outer member and the inner member is connected to the punch head and the other is connected to the rotating shaft 211, and the other of the outer member and the inner member is connected to the rotating shaft 211, And at least one punch adjusting motor capable of engaging with a rotational axis of each of the forming punches to provide a torque, Wherein the punch adjusting motor is provided with a latching pin at one end of a rotary shaft of the punch adjusting motor and at one end of the rotary shaft of the punch adjusting motor is provided with a latching groove into which the latching pin can be inserted, And the rotating shaft is engaged with the rotating shaft of the forming punch to provide torque. "

The applicant of the present invention has proposed a technique that is more advanced than the above-described patent technology. That is, it reduces the reaction force of the material during the molding process and reduces the load applied to the material, R & D was needed to reduce the dimple phenomenon of the material.

Korean Patent Registration No. 10-1034592 entitled " Sheet Metal Forming Apparatus Including a Large Number of Forming Punches and Sheet Metal Forming Method "(Registered on May 4, 2011).

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned needs, and it is an object of the present invention to provide a method of manufacturing a punch comprising a plurality of upper and lower forming punches, The present invention provides a "variable shaping apparatus using a local bending effect" capable of improving the formability of a material by causing a local (bending) bending effect by arranging the forming punch so as to be located between the central axes of adjacent forming punches on the opposite sides .

According to the present invention, a plurality of forming punches are arranged above and below a plate material. Each of the forming punches includes a punch head, a hollow outer member having internal threads, and an outer Wherein one of the outer member and the inner member is connected to the punch head and the other one is connected to a rotating shaft, and at least one of the outer member and the inner member is engaged with the rotation axis of each of the forming punches, Wherein a plurality of forming punches are vertically arranged in a plurality of rows and a plurality of rows, and a center axis of the forming punch on one side of the upper and lower sides of the plurality of forming punches corresponds to the adjacent forming punches on the opposite side, The local bending of the plate material occurs during molding and the moldability of the plate material is improved It provides a variable-forming apparatus using a local bending effect of the gong.

According to the present invention, the vertical center axis of the molding punch on one side of the upper and lower sides of the plurality of forming punches is correspondingly positioned between the vertical center axes of the adjacent forming punches on the opposite side of the opposite side so that the local bending effect occurs during molding, And the moldability is improved.

In addition, there is an advantage that the molding force required more than the conventional one can be reduced owing to the local bending effect.

Further, under the same conditions, there is an advantage that a material of stronger material can be formed than in the prior art.

In addition, the predetermined gap between the forming punches has an advantage that the upper and lower forming punch causes local bending to act on the side where the size of the gap becomes smaller, and the formability is improved.

In addition, there is an advantage that the dimple of the molded article is reduced by the local bending effect.

1 is a cross-sectional view schematically showing a plate material forming apparatus using a conventional metal mold.
2 is a cross-sectional view schematically showing a conventional die-less sheet material forming apparatus.
3 is a cross-sectional view schematically showing a sheet material forming apparatus according to the prior art.
4 is a cross-sectional view schematically showing a variable molding apparatus using a local bending effect according to an embodiment of the present invention.
5 is a diagram for explaining the concept of the "A" portion of FIG.
Figure 6 is a schematic conceptual cross-sectional view of a molding apparatus for comparing the present invention and the prior art.
Fig. 7 is a comparative perspective view of an exemplary band-shaped molding showing a stress distribution according to the present invention and prior art examples; Fig.
8 is a comparative perspective view of an exemplary band-shaped molded article showing strain distributions according to the present invention and prior art embodiments.
9 is a comparative perspective view of a band-shaped molded article showing indentations according to the present invention and prior art examples at various angles.
10 is a schematic conceptual perspective view and a cross-sectional view of a molding apparatus for comparing the present invention and prior art.
11 is a comparative perspective view of an exemplary plate-shaped molded article showing a stress distribution according to the present invention and prior art example.
12 is a comparative perspective view of an exemplary plate-shaped molding showing a strain distribution according to the present invention and prior art embodiments.
13 is a comparative perspective view of an exemplary plate-shaped molded article showing indentations according to the present invention and prior art embodiments.
Fig. 14 is a perspective view of the lower forming punch set of the variable molding apparatus of Fig. 4;
Fig. 15 is an exploded enlarged cross-sectional view of a forming punch of the variable molding apparatus of Fig. 4;
16 is a plan view showing an embodiment of a punch adjusting motor arrangement of a variable shaping apparatus according to the present invention.
17 is a side view of the punch adjustment motor arrangement of FIG.
18 to 20 are plan views of modified embodiments of the punch adjustment motor arrangement of the variable shaping apparatus according to the present invention.
21 is a perspective view schematically showing one embodiment of a connecting portion of a rotating shaft of a forming punch and a rotating shaft of a motor.
22 is a perspective view schematically showing another embodiment of the connecting portion of Fig.
23 is a sectional view showing the embodiment of FIG. 22 more specifically.
24 and 25 are perspective views schematically showing a modified embodiment of the connecting portion of Fig.
26 is a view schematically showing a method of dividing and forming a large plate using the variable shaping apparatus of the present invention.

Before describing the present invention in detail, it is to be understood that the present invention is not limited to the specific embodiments but includes all changes, equivalents, and alternatives included in the spirit and technical scope of the present invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software .

It is to be understood that the components of the embodiments described with reference to the drawings are not limited to the embodiments and may be embodied in other embodiments without departing from the spirit of the invention. It will be appreciated that although the description is omitted, multiple embodiments may be implemented again in one integrated embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In addition, in the drawings, there is a portion in which the size ratios between the elements are represented to be slightly different or parts having different sizes are expressed in different parts. However, And therefore, a detailed description thereof will be omitted.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

A variable shaping apparatus using a local bending effect according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a cross-sectional view schematically showing a variable molding apparatus using a local bending effect according to an embodiment of the present invention. As shown in the figure, the variable shaping apparatus of the present invention is arranged up and down with a plurality of forming punches 1 sandwiched by a plate material 5 to be formed. 5 is a diagram for explaining the concept of the present invention.

4 and 5, the technical idea of the present invention can be roughly understood. FIG. 5A shows a technical idea of the present invention, and FIG. 5B shows a conventional technology. As shown in FIG. 5 (b), since the upper and lower punches correspond to each other in a one-to-one correspondence, the upper and lower punches coincide with the central axis, and the local bending effect can not be produced. That is, when the force of P is provided downward in each of the punches positioned on the upper side of the plate to be formed, the force of each of the lower punches correspondingly corresponds to the static force balance. Therefore, the sum of the forces of the upper punch is 2P and the sum of the forces of the lower punch is 2P according to the equilibrium of force in the local region.

Also, it can be seen that the local bending phenomenon can not occur because the central axes coincide with each other due to the mutual forces of the punches, and it takes 4P of the upper and lower punches in the local region.

Since such required forces are applied to the entire plate, a great deal of force is required in the prior art.

가 되고 합이 P가 되므로, 국부적 영역에서 상하 펀치 합 2P가 소요됨을 잘 알 수 있다.However, according to the present invention, as shown in FIG. 5A, when the entire local region is analyzed, the sum of the forces of the corresponding punches on the other side becomes P when the force P of one punch acts. That is, each of the corresponding punches

And the sum is P, it can be seen that the sum of the upper and lower punches is 2P in the local area.

Therefore, when compared with the prior art, it can be seen that the force required in the present invention is considerably reduced, and a force is applied in the middle between the molding punches on the one side and the molding punch on the other side, The moldability can be greatly improved by the effect.

For reference, in the present invention, the local bending effect is a phenomenon in which the moldability is improved by causing bending of the molded product in the partial unit area during molding of the upper and lower forming punches.

The effect of the variable shaping apparatus according to the embodiment of the present invention in which such a local bending effect is applied can be more clearly understood by the following.

6 to 9 show the result of applying the material of the molded article, that is, the material of the plate material, Al 3003-H14, the thickness of the plate material, and the radius of the molding punch, 20 mm.

6 (a) is a virtual vertical center axis passing through the centers of the respective forming punches, and the vertical center axis of the forming punch on one side of the upper and lower sides corresponds to the vertical center axis of the other side forming punch And FIG. 6 (b) is a prior art in which the imaginary vertical center axes passing through the centers of the respective forming punches are positioned vertically one by one corresponding to each other.

Fig. 7 shows the stress distribution of an exemplary band-shaped molding formed by the present invention and a conventional technique. Fig. 7 (a) shows the stress distribution of a molded product by applying the variable shaping apparatus of the present invention, (B) shows a stress distribution of a molded product by applying a plate material forming apparatus of the prior art. As shown in FIG. 7, the stress distribution in the present invention is generally low and uniform, but the prior art shows excessive stress concentration at a particular portion.

Fig. 8 shows a strain distribution of an exemplary band-shaped molded article formed by the present invention and a conventional art. Fig. 8 (a) shows a strain distribution of a molded product by applying the variable-shaping apparatus of the present invention, (B) shows the strain distribution of a molded product by applying a plate material forming apparatus of the prior art. As shown in FIG. 8, although the strain distribution is generally small and uniform, the prior art shows an excessive strain at a certain point.

9 shows indentations or dimples of an exemplary band-shaped molding formed by the present invention and a conventional technique. Figs. 9 (a1), (a2) and (a3) (B1), (b2) and (b3) of FIG. 8 show the indentations of the molding at various angles by applying the plate material molding apparatus of the prior art. As shown in FIG. 9, the indentations of the molded article are substantially absent or weak in the present invention, but indentations are clearly seen in various parts of the prior art.

For reference, indentations or dimples are used in the same sense in the present invention. That is, the indentation or dimple is defined as a mark or trail having a small decrease in the surface of the molding by the molding punch.

Figs. 10 to 13 show the result of applying SS 400 (steel), the thickness of the plate material 2 mm, and the radius of the forming punch 20 mm, to the material of the molded article, that is, the plate material.

10 (a) is a virtual vertical center axis passing through the centers of the respective forming punches, and the vertical center axis of the forming punch on one side of the upper and lower sides corresponds to the vertical center axis of the other side forming punch And FIG. 10 (b) is a three-dimensional representation in which the virtual vertical center axes passing through the centers of the respective forming punches are vertically positioned one by one corresponding to each other.

Further, in the variable forming apparatus using the local bending effect according to an embodiment of the present invention, a plurality of forming punches may be arranged in a plurality of rows and a plurality of rows in the upper and lower sides.

For example, in a plurality of upper and lower forming punches, if the upper forming punches are arranged in one of the rows 1 to 6 and in one of the rows 1 to 12, 12 < / RTI >

In the variable forming apparatus using the local bending effect according to another embodiment of the present invention, the forming punches on one side of the plurality of forming punches are arranged in rows of m and n (where m and n are each a natural number of 1 or more) May be arranged in rows of (m + 1) and columns of (n + 1).

For example, in a plurality of upper and lower forming punches, if the upper forming punch is arranged in one of the rows 1 to 6 and in one of the rows 1 to 12, 13 < / RTI > Or the lower molding punch is arranged in one of the rows 1 to 6 and the column in one of the columns 1 to 12, the upper molding punch is arranged in one of the rows 1 to 7 and the column 1 to 13.

Fig. 11 shows the stress distribution of an exemplary plate-shaped molding formed by the present invention and a conventional technique. Fig. 11 (a) shows the stress distribution of a molded product by applying the variable-shaping apparatus of the present invention, (B) shows a stress distribution of a molded product by applying a plate material forming apparatus of the prior art.

12 (a) shows a strain distribution of a molded product having a Max of 0.024787 by applying the variable shaping apparatus of the present invention, and FIG. 12 Fig. 12 (b) shows the strain distribution of a molded product having a Max of 0.25508 by applying a conventional sheet material forming apparatus. As shown in FIG. 12, the present invention exhibits a strain distribution evenly and generally, but the prior art shows an excessive strain at a specific portion. Therefore, the difference between the present invention and the prior art is clearly shown.

FIG. 13 shows indentations or dimples of an exemplary plate-shaped molding formed by the present invention and a conventional technique. FIG. 13 (a) is a graph showing the indentation or dimple of a molded article at various angles by applying the variable- FIG. 13 (b) shows indentations of the molded article at various angles by applying the plate material forming apparatus of the prior art. Therefore, as shown in FIG. 13, the indentation of the molded article is substantially absent or weak in the present invention, but the indentation appears in many parts of the prior art. Therefore, the difference between the present invention and the prior art is clearly shown.

Fig. 14 is a perspective view of the lower molding punches 1, and Fig. 15 is an enlarged view of the molding punch 1 in a separated state.

As shown, each forming punch 1 includes a punch head 3, a hollow outer member 7, and an inner member 9. The inner surface of the outer member 7 is provided with a thread (not shown), and the outer surface of the inner member 9 is provided with a thread engaging with the thread of the outer member 7. Thus, the inner member 9 can be rotated relative to the outer member 7 and inserted or discharged into the hollow of the outer member 7. [ That is, each of the forming punches 1 is composed of two members fastened with threads, and the length is adjusted by relative movement, so that it is possible to support a large pressure. In the illustrated embodiment, the outer member 7 is formed in a circular shape, but may be formed in a polygonal shape such as a rectangular shape or an octagonal shape.

In this embodiment, the punch head 3 is connected to one end of the outer member 7, and the rotary shaft 11 is connected to one end of the inner member 9. Alternatively, however, the punch head may be connected to the inner member and the rotating shaft may be connected to the outer member.

A punch adjusting motor 13 is engaged with the rotary shaft 11 connected to the inner member 9 to provide an appropriate torque to adjust the overall length of the forming punch 1 according to the target shape of the plate material.

The punch head 3 may be formed as a curved surface such that the surface in contact with the plate material has a shape of a part of a spherical surface, and the curvature thereof is selected so as not to affect the curvature of the plate material in plate material molding. In the illustrated embodiment, the outer shape of the punch head 3 is formed in a circular shape, but it may be formed in a polygonal shape such as a square shape or an octagonal shape.

The punch head 3 can be detachably coupled to the end of the outer member 7 by thread engagement or the like. With this configuration, when the punch head 3 is at the upper limit or when another punch head having a suitable curvature is required, the punch head can be simply replaced.

An elastic cap 15 may be provided on a surface of the punch head 3 in contact with the plate member. This elastic cap 15 prevents damage and wear of the punch head due to repeated molding. If an elastic cap is not provided, it is desirable to provide an elastic plate between the punch heads and the plate during molding.

The forming punches 1 constituted as described above are arranged in a plurality of rows and a plurality of rows respectively on the upper and lower sides to constitute a forming punch set (refer to FIG. 6), and each of the upper forming punch sets or the lower forming punch sets And a bearing 19 is provided between the support portion 17 and each of the rotary shafts 11. [ Further, the upper shaping punch set or the lower shaping punch set is installed in the outer supporting frame 21, respectively.

One or more punch adjustment motors 13 are disposed on the punch rotation axes of the set of forming punches (below the punch rotation axes in the lower forming punch set, for convenience sake, with reference to the upper forming punch set) A single punch adjusting motor 13 may be provided for each forming punch 1 as shown in FIG. 3B. However, by using the number of adjusting motors less than the number of punches as described below, the configuration can be simplified and the cost can be reduced.

FIG. 16 is a plan view of an embodiment in which a punch adjusting motor is disposed on a forming punch set. The four motors 13a, 13b, 13c and 13d arranged in a row in the longitudinal direction form one module 23a And the motor module 23a and the longitudinal moving motor 25 are connected to the transverse moving motor 27 together. 17, the four motors 13a, 13b, 13c and 13d constituting one module 23a are vertically moved by the longitudinally moving motor 25 as one body, The motor module 23a and the longitudinal movement motor 25 are moved horizontally together by the lateral movement motor 27. [ That is, as shown in the drawing, one module 23a moves vertically in one row to control the set of punches of 12 rows x 16 columns, moves the punch three times, moves to the next row, Both punches can be adjusted. The longitudinal or transverse movement motors 25 and 27 and the respective punch adjustment motors 13a, 13b, 13c and 13d are connected to a control device (not shown) And the number of revolutions of the motor for adjusting the punch length according to the number of revolutions.

That is, it is not necessary to install the same number of punch adjusting motors for each forming punch, and a small number of punch adjusting motors can be moved using moving motors to control a plurality of forming punches. Thereby, the number of motors can be reduced to simplify the configuration and effectively control the lengths of the forming punches.

18 to 20 show other embodiments of the punch adjustment motor arrangement. In the embodiment of Fig. 18, the twelve adjusting motors arranged in a row in the longitudinal direction form one module 23b and are connected to the transverse moving motor 27. Fig. Therefore, the motors move horizontally without moving vertically. To control a set of 12 punch x 16 punch forming punches as shown in the drawing, the module 23b of the punch adjusting motor moves the sixteen rows horizontally, All punches can be adjusted.

19, sixteen motors of four rows by four columns form one module 23c to be connected to the longitudinal moving motor 25, and the motor module 23c and the longitudinal moving motor 25 And is connected to the lateral movement motor 27. Accordingly, in order to control the set punch set of 12 rows x 16 columns as shown in the drawing, one module 23c moves vertically and adjusts the punches three times, thereby finishing the adjustment of four rows of punches, By repeating this process, you can control all 16 punches.

In the embodiment of FIG. 20, only one punch adjusting motor 13 is connected, the punch adjusting motor is connected to the longitudinal moving motor 25, and the punch adjusting motor 13 and the longitudinal moving motor 25 are connected together And is connected to the lateral movement motor 27.

Therefore, in order to control the set punch set of 12 rows x 16 columns as shown in the drawing, the punch adjusting motor can vertically move and adjust each of the twelve forming punches in one row, move to the next row, You can control everything.

In order to allow one punch adjusting motor to control the various forming punches, each punch adjusting motor has to be repeatedly engaged and disengaged from the forming punch so that a detachable engaging configuration is provided at the connecting portion of the rotating shaft of the forming punch and the motor .

One example of the engagement structure is shown in Fig. A locking pin 29 is provided at one end of the rotary shaft 11 of the molding punch and a locking groove 33 into which the locking pin 29 can be inserted is formed at one end of the rotary shaft 31 of the punch adjusting motor. / RTI > That is, when the punch adjusting motor 13 moves in the forming punch direction and the engaging pin 29 is inserted into the engaging groove 33, the rotational force of the punch adjusting motor 13 is transmitted to the forming punch 1, ). When the punch adjusting motor 13 moves in the direction opposite to the forming punch and the engaging pin 29 comes out of the engaging groove 33, the engaging is released and the punch adjusting motor 13 can not rotate the inner member of the forming punch.

At this time, the latching groove 33 may be formed to be much larger than the thickness of the latching pin 29 so that the latching pin 29 can be easily inserted. In the control device, the latching groove 33 is formed on the latching pin 29 The engagement pin 29 is brought into contact with the side wall of the latch groove 33 through a section where idling does not occur to sense the timing at which the torque of the control motor increases and to provide the rotation speed corresponding to the length adjustment amount of the forming punch from this point . By doing so, the precise length of each forming punch 1 can be adjusted, and the plate material can be accurately formed.

Fig. 22 shows another embodiment of a detachable engagement structure of the connecting portion of the motor and the rotating shaft of the forming punch. The convex portion 35 is provided at one end of the rotary shaft 31 of the punch adjusting motor and a concave portion 37 having a complementary shape to the convex portion 35 is provided at one end of the rotary shaft 11 of the molding punch / RTI > Therefore, when the convex portion 35 of the motor is inserted into the concave portion 37 of the forming punch, the rotational force of the adjusting motor 13 is transmitted to the forming punch 1 to rotate the inner member 9.

When the convex portion 35 of the motor is separated from the concave portion 37 of the molding punch, the engagement is released and the punch adjusting motor 13 can not rotate the inner member of the forming punch.

At this time, the punch adjusting motor 13 is hardly moved so that the convex portion 35 is directly inserted into the concave portion 37 of the forming punch. 23, the rotary shaft 31 is configured to be able to move in and out by a predetermined distance in the housing 39 to which the adjusting motor 13 is fixed, and a convex portion 35 is provided at one end of the rotary shaft 31 of the motor An engaging head 41 is provided and an elastic spring 43 is provided between the housing 39 and the engaging head 41 around the rotational axis 31 of the motor.

When the convex portion 35 of the engaging head 41 comes into contact with one end of the rotary shaft 11 of the forming punch but can not be inserted into the concave portion 37, the rotation shaft of the motor is inserted into the housing, When the engaging head 41 rotates together with the motor rotating shaft 31 and the convex portion 35 is fitted to the concave portion 37, the spring 43 is extended and the rotating shaft 31 is moved to the housing 39, So that the convex portion 35 can be inserted into the concave portion 37. Since the convex portion 35 and the concave portion 37 have a complementary shape, the rotational force of the adjusting motor 13 can be directly transmitted to the inner member 9 of the forming punch.

In the embodiment shown in Figs. 22 and 23, the convex portion 35 has a straight shape, but may have a Y-shape as shown in Fig. 24 as a modification example, a cross shape as shown in Fig. 25, . In this case, it is a matter of course that the concave portion 37 can have a shape corresponding to the convex portion 35.

A method of forming a sheet material using the sheet material forming apparatus configured as above is as follows.

First, a plurality of forming punches are vertically arranged in accordance with a target shape of the plate material, and the central axis of the forming punch on one side of the upper and lower sides of the plurality of forming punches corresponds to the position between the center axes of the adjacent forming punches on the opposite side . For example, if the one side is the upper side, the other side is the lower side. Therefore, the forming punch on one side is a forming punch on the upper side of the upper and lower sides of a plurality of forming punches, and the forming punch on the other side is a forming punch on the lower side of the upper and lower sides of a plurality of forming punches.

Next, final length data that each forming punch 1 should have is calculated according to the target shape of the plate material. The initial length data, which is the current length of each forming punch 1, is received and compared with the final length data to calculate a required length adjustment amount. The number of revolutions at which the inner member 9 is to be rotated is calculated corresponding to the required length adjustment amount of each forming punch 1.

A movement signal is transmitted to the longitudinal movement motor 25 or the lateral movement motor 27 to move the punch adjustment motor 13 to the engagement position with the molding punch 1 whose length is to be adjusted. Then, the punch adjusting motor 13 is engaged with the rotating shaft 11 of the forming punch 1, and the punch adjusting motor 13 is operated so as to provide a torque in accordance with the calculated number of revolutions for each forming punch 1.

The process of adjusting the forming punch 1 is repeated by moving the punch adjusting motor 13 until the length of all the forming punches is finished.

After all the forming punch lengths have been adjusted, length data after adjustment of each forming punch is received and compared to final length data to see if there is a difference. If there is a difference, start the step of calculating the length adjustment amount of each forming punch and adjust the forming punch again.

If all of the forming punches have the required final length, press the sheet material with a set of upper and lower forming punches to form.

In addition, when a large plate member, particularly a plate member larger than a molding apparatus, is molded using the variable shaping apparatus of the present invention, the plate member can be divided into a plurality of sections and molded as shown in Fig.

Specifically, first, the plate 5 to be formed is divided into a plurality of sections 45 corresponding to the size of the plate material forming apparatus. At this time, it is preferable that the plurality of sections are divided so as to overlap each other by a predetermined amount. One of the divided sections is selected, and the sheet material is moved so that the selected section is arranged in the sheet material forming apparatus. Thereafter, the final length data of each forming punch is calculated according to the target shape of the selected section, and the length of each forming punch 1 is adjusted by the punch adjusting motor 13. Then, a selected section of the plate material 5 is formed by upper and lower shaping punches whose lengths are adjusted.

The molding section of the plate material is reselected and moved to the plate material forming apparatus until the formation of the entire plate material is completed and the process of adjusting the length of each punch according to the target shape of the selected section and molding is repeated.

Therefore, in the variable forming apparatus using the local bending effect according to the embodiment of the present invention, a plurality of forming punches are arranged in the upper and lower sides, and each of the forming punches includes a punch head, a hollow outer member having internal threads, Wherein one of the outer member and the inner member is connected to the punch head and the other one is connected to a rotating shaft and is engaged with a rotation axis of each of the forming punches to generate a torque And one or more punch adjustment motors that can provide one or more punch adjustment motors.

In the variable molding apparatus of the present invention, each molding punch is composed of two members fastened with threads, and the length can be adjusted by the torque provided by the motor, so that a large pressure can be supported.

A plurality of forming punches are arranged in a plurality of rows and a plurality of rows in the vertical direction and the central axes of the molding punches on one side of the upper and lower sides of the plurality of forming punches are located between the central axes of the adjacent forming punches on the opposite side corresponding thereto Local bending occurs at the time of molding and the moldability of the molded product is improved.

(M + 1) rows and (n + 1) columns are arranged in a row of m and n columns, where m and n are each a natural number of 1 or more, in a plurality of forming punches. .

The at least one punch adjusting motor is connected to the transverse moving motor or the longitudinal moving motor. In this case, the punch adjusting motor may form two or more modules, and the module may be connected to the transverse moving motor or the longitudinal moving motor.

Therefore, it is not necessary to install a punch adjusting motor in each forming punch, and a small number of punch adjusting motors can be moved using moving motors to control a plurality of forming punches. That is, the number of motors can be reduced to simplify the configuration of the apparatus.

A control device is connected to the punch adjusting motor or the moving motor so as to transmit the number of rotations, punch position information and the like according to the target shape.

A plurality of forming punches arranged vertically are connected to a common support portion on the upper or lower side, and a bearing can be provided between the support portion and each of the rotation shafts. In this case, a plurality of forming punches are installed in the upper or lower outer support frame .

The punch head may have a curved surface contacting the plate member, and the side surface may be formed of a circular or polygonal shape.

The punch head can be configured to be removable and thus replaceable with a new punch head or with a punch head of suitable curvature.

The punch head can be provided with a removable elastic cap, thereby preventing damage and wear of the punch head.

The outer member has a circular hollow portion having an internal thread, and the outer shape may be formed in a circular or polygonal shape.

In order to control a plurality of forming punches by a single punch adjusting motor, the punch adjusting motor must be repeatedly engaged and disengaged from the forming punch. To this end, a punch pin is provided at one end of the rotating shaft of the forming punch, In this case, when the engaging pin is inserted into the engaging groove, the rotating shaft of the punch adjusting motor is engaged with the rotating shaft of the forming punch to provide a torque can do.

In another embodiment, a convex portion is provided at one end of the rotation shaft of the punch adjustment motor, and a concave portion having a complementary shape to the convex portion may be provided at one end of the rotation shaft of the forming punch. In this case, The rotating shaft of the punch adjusting motor is engaged with the rotating shaft of the forming punch to provide torque.

At this time, the punch adjusting motor is constituted such that the rotating shaft is capable of being pushed in and out by a predetermined distance in a fixed housing, and an engaging head having a convex portion is provided at one end of the rotating shaft of the punch adjusting motor, An elastic spring can be provided. In this configuration, when the convex portion of the engaging head contacts one end of the rotary shaft of the forming punch but can not be inserted into the concave portion, the rotary shaft is inserted into the housing and the spring is contracted. When the rotary shaft is rotated and the convex portion is fitted to the concave portion, The rotation shaft projects from the housing and the convex portion can be inserted into the concave portion.

The convex portion may have various shapes that can be engaged with the concave portion such as a straight shape, a Y shape, or a cross shape.

Therefore, the variable shaping apparatus using the local bending effect according to the embodiment of the present invention can be expected to have the following effects.

In the prior art, since the forming punches are vertically corresponding to each other at a ratio of 1: 1, the reaction force becomes large. That is, in the prior art, since the central axes of the forming punches are vertically aligned with each other at a ratio of 1: 1, the reaction force during molding may be very large and local bending phenomenon does not occur and excessive forming force is required.

However, according to the present invention, the vertical center axis of the molding punch on one side of the upper and lower sides of the plurality of forming punches is correspondingly positioned between the vertical center axes of the adjacent forming punches on the opposite side, There is an advantage that the formability is reduced but the formability is improved.

That is, since the forming punches correspond to 1: 2 in a top-bottom and top-to-bottom not corresponding to 1: 1, the reaction force is reduced and the moldability due to the bending phenomenon is increased.

In addition, there is an advantage that the plate material can be formed with less forming force than the conventional one due to the local bending effect. That is, even if a molding apparatus of the same condition is used, there is an advantage that a material of stronger material can be formed than in the prior art.

In addition, generally, in the molding apparatus, there is a predetermined gap between each forming punch to smoothly transfer the position of the forming punch. Therefore, in the prior art, when the gap is large during molding, that is, when it is spread in mutually opposite directions, the molding may be negatively affected.

However, according to the present invention, since the forming punches are interlaced with each other between the gaps, the size of the gap acts on the side where the gap is reduced, and thus the moldability is improved.

Further, there is an advantage that the indentation or dimple of the molded article is reduced because the molding punches do not mutually abut against each other at the same point up and down.

Further, since the indentation or dimple is reduced, there is an advantage that the use of the elastic material such as the urethane pad can be reduced or is not used in some cases.

The variable shaping apparatus using the local bending effect according to the present invention has been described with reference to the embodiments. It is to be understood that both the foregoing description and the following description are illustrative of the present invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of explanation, And the like. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention as set forth in the following claims.

1: forming punch
11:
17: Support
19: Bearings
21: External support frame

Claims (11)

A variable-shape forming apparatus using a local bending effect in which a plurality of forming punches are arranged above and below a plate material,
Each forming punch comprising a punch head, a hollow outer member having internal threads, and an inner member having an external thread to be inserted into the outer member, wherein one of the outer member and the inner member is connected to the punch head And at least one punch adjusting motor connected to the rotating shaft and capable of providing a torque by engaging with the rotational axis of each of the forming punches,
Wherein the plurality of forming punches are arranged in a plurality of rows and a plurality of columns in an up and down direction,
Since the center axis of each of the molding punches on one side of the upper and lower sides of the molding punch is located between the central axes of the adjacent molding punches on the opposite side corresponding to the central axis, local bending of the plate material occurs during molding, Wherein the bending effect is improved. The method according to claim 1,
(M + 1) rows and (n + 1) th rows are arranged in a row of m and n columns (m and n are each a natural number of 1 or more) in the plurality of forming punches, ). ≪ / RTI > 21. A variable shaping apparatus using a local bending effect. The method according to claim 1,
Wherein a punch pin is provided at one end of a rotating shaft of the forming punch and an engaging groove is provided at one end of a rotating shaft of the punch adjusting motor so that the engaging pin can be inserted, Wherein the rotation axis of the punch is engaged with the rotation axis of the forming punch to provide a torque, and the at least one punch adjusting motor is connected to the transverse moving motor or the longitudinal moving motor. The method according to claim 1,
Wherein the punch adjusting motor comprises at least two modules, and the module is connected to the transverse moving motor or the longitudinal moving motor. The method according to claim 1,
Wherein the plurality of forming punches arranged vertically are connected to a common support portion on the upper or lower side, and a bearing is provided between the support portion and each of the rotation shafts. The method according to claim 1,
Wherein the plurality of forming punches arranged in the vertical direction are installed in the upper or lower outer support frame. The method according to claim 1,
Wherein the punch head has a curved surface contacting the plate member and a side surface formed of a circular or polygonal shape. The method according to claim 1,
Wherein the punch head is detachable. The method according to claim 1,
Wherein the punch head is provided with a removable elastic cap. The method according to claim 1,
Wherein the outer member has a circular hollow portion having an internal thread and the outer shape is circular or polygonal. The method of claim 3,
And a controller is connected to the punch adjusting motor or the moving motor.

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